You could try turning on Do Not Disturb for all numbers, all the time. The calls and texts will technically still happen but you won’t be notified of them. You may be able to avoid voicemails if you never set it up. You’ll see all your texts if you ever open the app although you may be able to disable or remove it. (YMMV based on your particular phone.)

It may just be a difference in use case. I don’t use navigation apps for my daily and local trips. I use navigation when I’m going to be driving hundreds of miles to a new location and don’t already know how to get there.

If your primary goal is finding out how to get from A to B and not caring about the very fastest way to get from A to B right now, then you don’t need traffic data.